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// +build !confonly
package encoding
//go:generate go run v2ray.com/core/common/errors/errorgen
import (
"io"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/proxy/vless"
)
const (
Version = byte(0)
)
var addrParser = protocol.NewAddressParser(
protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6),
protocol.PortThenAddress(),
)
// EncodeRequestHeader writes encoded request header into the given writer.
func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons) error {
buffer := buf.StackNew()
defer buffer.Release()
if err := buffer.WriteByte(request.Version); err != nil {
return newError("failed to write request version").Base(err)
}
if _, err := buffer.Write(request.User.Account.(*vless.MemoryAccount).ID.Bytes()); err != nil {
return newError("failed to write request user id").Base(err)
}
if err := EncodeHeaderAddons(&buffer, requestAddons); err != nil {
return newError("failed to encode request header addons").Base(err)
}
if err := buffer.WriteByte(byte(request.Command)); err != nil {
return newError("failed to write request command").Base(err)
}
if request.Command != protocol.RequestCommandMux {
if err := addrParser.WriteAddressPort(&buffer, request.Address, request.Port); err != nil {
return newError("failed to write request address and port").Base(err)
}
}
if _, err := writer.Write(buffer.Bytes()); err != nil {
return newError("failed to write request header").Base(err)
}
return nil
}
// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator *vless.Validator) (*protocol.RequestHeader, *Addons, bool, error) {
buffer := buf.StackNew()
defer buffer.Release()
request := new(protocol.RequestHeader)
if isfb {
request.Version = first.Byte(0)
} else {
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
return nil, nil, false, newError("failed to read request version").Base(err)
}
request.Version = buffer.Byte(0)
}
switch request.Version {
case 0:
var id [16]byte
if isfb {
copy(id[:], first.BytesRange(1, 17))
} else {
buffer.Clear()
if _, err := buffer.ReadFullFrom(reader, 16); err != nil {
return nil, nil, false, newError("failed to read request user id").Base(err)
}
copy(id[:], buffer.Bytes())
}
if request.User = validator.Get(id); request.User == nil {
return nil, nil, isfb, newError("invalid request user id")
}
if isfb {
first.Advance(17)
}
requestAddons, err := DecodeHeaderAddons(&buffer, reader)
if err != nil {
return nil, nil, false, newError("failed to decode request header addons").Base(err)
}
buffer.Clear()
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
return nil, nil, false, newError("failed to read request command").Base(err)
}
request.Command = protocol.RequestCommand(buffer.Byte(0))
switch request.Command {
case protocol.RequestCommandMux:
request.Address = net.DomainAddress("v1.mux.cool")
request.Port = 0
case protocol.RequestCommandTCP, protocol.RequestCommandUDP:
if addr, port, err := addrParser.ReadAddressPort(&buffer, reader); err == nil {
request.Address = addr
request.Port = port
}
}
if request.Address == nil {
return nil, nil, false, newError("invalid request address")
}
return request, requestAddons, false, nil
default:
return nil, nil, isfb, newError("invalid request version")
}
}
// EncodeResponseHeader writes encoded response header into the given writer.
func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *Addons) error {
buffer := buf.StackNew()
defer buffer.Release()
if err := buffer.WriteByte(request.Version); err != nil {
return newError("failed to write response version").Base(err)
}
if err := EncodeHeaderAddons(&buffer, responseAddons); err != nil {
return newError("failed to encode response header addons").Base(err)
}
if _, err := writer.Write(buffer.Bytes()); err != nil {
return newError("failed to write response header").Base(err)
}
return nil
}
// DecodeResponseHeader decodes and returns (if successful) a ResponseHeader from an input stream.
func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*Addons, error) {
buffer := buf.StackNew()
defer buffer.Release()
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
return nil, newError("failed to read response version").Base(err)
}
if buffer.Byte(0) != request.Version {
return nil, newError("unexpected response version. Expecting ", int(request.Version), " but actually ", int(buffer.Byte(0)))
}
responseAddons, err := DecodeHeaderAddons(&buffer, reader)
if err != nil {
return nil, newError("failed to decode response header addons").Base(err)
}
return responseAddons, nil
}
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